Maxima Hi-Test Octane Booster 16 oz.

Part# 1326140001

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MSRP: $6.99 - You save $1.04 (15% off)

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I have had good luck with this in the past. Could be in my head but I think it may increase power somewhat noticeably on my 2015 YZ250f. My buddies and I dumped some in my brother's 2014 KTM 250SX-f and before a trail ride a while back - asked him if it felt different and he said it seemed to be running strong that day "for some reason." Think it may work!

I have not found any other octane boost out there that has all of the good attributes of the Maxima Hi-Test. First, it works as it stops the pinging. Secondly, it does not stain plastic fuel tanks (as some other brands do... watch out for anything sold in a metal can if this is a concern for you) Thirdly, it does a great job of conditioning the fuel. I've stored bikes for 12 months + with no additional stabilizers and had no issues with varnish or fuel clogs.

I've tried many different octane boosters and Maxima Hi-test reduces/eliminates detonation (pinging)without nasty side effects. (some other octane boosters will discolor your plastic fuel tanks). It also makes a good fuel stabilizer. I notice no loss in fuel performance when storing for a few months here and there, and have had not had issues with fuel deposits in my carburators. I see a couple other reviews that knock it for not adding power, I would like to point out that increasing the octane of your fuel does NOT increase power... that's not the point. The point is to reduce engine damage in high-compression engine applications, and Maxima Hi-test is the next best thing to running race fuel.

I just put a wieseco 11:1 compression piston and stage 2 hotcam in my 07 honda 400ex and i was running premiem 98 octane pump gas and my motor started knocking and pinging,when i added about 5 ounces of this maxima octane booster to my gas tank it compleatly stoped all the noises! And it made it have a much snapier throttle responce.I will be buying more of this for sure, wont ride without it.

BEST ANSWER:That's what I do if my fuel is going to sit around more than a month. I use Hi-Test for my KTM 250xcw smoker to boost octane from 91 up to about 95.

I also sometimes use Bey-Ray All in one for the 500exc dual sport. However, All in One is very concentrated with 4 oz all that's needed to treat 40 gallons = 1/2 oz (15 ml) for 5 gallons. So you need an accurate graduated cylinder to measure no larger than 100 ml capacity.

BEST ANSWER:That's what I do if my fuel is going to sit around more than a month. I use Hi-Test for my KTM 250xcw smoker to boost octane from 91 up to about 95.

I also sometimes use Bey-Ray All in one for the 500exc dual sport. However, All in One is very concentrated with 4 oz all that's needed to treat 40 gallons = 1/2 oz (15 ml) for 5 gallons. So you need an accurate graduated cylinder to measure no larger than 100 ml capacity.

I used several different kinds of fuel stabilizer (Yamalube Fuel Med, Star Tron, Sta-Bil Ethanol treatment) with Maxima Hi Test and never had any issues. I was running around 12/1 Compression and added them to Super Unleaded fuel.

BEST ANSWER:I typically do half a bottle (8oz) per 5 gallons of 91 octane gas for my '06 YZ250f and 450f. People generally think of octane boosters as snake oil, especially since 1 'point' is 0.1 octane. So 1 ounce of this will only raise the octane of 1 gallon of gas 0.2-0.4. I believe I can feel a difference in throttle response but it's probably all in my head. At the very least Hi-Test seems to keep the gas from going bad and the carbs from gumming up.

BEST ANSWER:I typically do half a bottle (8oz) per 5 gallons of 91 octane gas for my '06 YZ250f and 450f. People generally think of octane boosters as snake oil, especially since 1 'point' is 0.1 octane. So 1 ounce of this will only raise the octane of 1 gallon of gas 0.2-0.4. I believe I can feel a difference in throttle response but it's probably all in my head. At the very least Hi-Test seems to keep the gas from going bad and the carbs from gumming up.

BEST ANSWER:I don't really know if there is any contraindication for using HiTest with AVGAS 100LL. It is already 100 octane. Do you need to increase the ocatane more? In using the HITest to increase octane rating of 91 octane unleaded pump gas in California it provided some improvement (less detonation in higher compression engine) but I only used one bottle. I obtained better detonation reduction when I used Race Gas Race Fuel Concentrate.

BEST ANSWER:I don't really know if there is any contraindication for using HiTest with AVGAS 100LL. It is already 100 octane. Do you need to increase the ocatane more? In using the HITest to increase octane rating of 91 octane unleaded pump gas in California it provided some improvement (less detonation in higher compression engine) but I only used one bottle. I obtained better detonation reduction when I used Race Gas Race Fuel Concentrate.

I personally won't use aviation fuel. It is basically kerosene with a few additives. I prefer vp race gas. But for just trail riding I use Sunoco 93 plus maxima with no issues. I don't know if it would help the aviation fuel since it's kero based.